Are Paul's letters the product of Paul's intellect or God's use of Paul?
Paul's letters are not the product of his intellect or theological ability. They are the result of God using Paul as His instrument. Every Scripture writer wrote as moved by the Holy Spirit, so Paul's written letters carry divine weight and are the Word of God, unlike mere human speech.
Les explains that when he mentions Paul's writings, he is not talking about the man, his intellect, or his tremendous ability to produce theological truths. Instead, he is talking about the man God used to put these things in print. He emphasizes that no word of Scripture came to pass by human collection; every writer of the book wrote as moved by the Holy Spirit. Paul himself wrote that his speech was contemptible and his visage was not great, yet his letters were considered weighty. They are weighty because they became the Word of God.